Resistance color code chart



' Apri1'27, 1937.

RESISTANCE COLOR CODE CHART Filed 0G13. 5, 1955' 5 Sheets-Sheet l R i Q N VLSISU s N SWHO A3G09 H0103 `&

A swaflamyw/ A nuenlor Q( Mat Fedor; Jr.

April 27, 1937. M FEDOR, JR 2,078,602

RESISTANCE COLOR CODE CHART Filed Oct. 5, 1935 5 Sheets-Sheet 2 "sw `-Q\ 2 @Mm 5665 Q (9 we @M N s W Rr ocbggwcwo o E o o o N O O O o o o K? O O O O O o O O O O O O ORO O k O O O Q' 2,3 2

nvenlor A llomep April 27, 1937. M. FEDOR, JR

RESISTANCE COLOR CODE CHART Filed Oct. 5, 1935 5 Sheets-Sheet 5 nven (or A Homey N s 3 i n\ 0 v T ln M NM. www e w m z @y //X// M y B MW H NU Q CJ Y wl. u Q. RNL xg .mwa QL Nv ,\\l \N I uw u lil |H w N.\\l 4 m ww Q April 27, 1937. M. FEDOR. JR

RESISTANCE COLOR CODE CHART 5 Sheets-Sheet 4 Filed OCT.. 5, 1935 Inventor A Home);

April 27, 1937. M. FEDOR, JR

RESISTANCE COLOR CODE CHART 5 Sheets-Sheet 5 Filed Oct. 5, 1935 Inventor Maf/:e fedar, Ji.

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Patented Apr. 27, 1937 UNITED STATES PATENT OFFICE RESISTANCE CoLoR CODE CHART Mike Fedor, Jr., Dayton, Ohio Application october 5, 1935, serial No. 49,199

2 Claims.

This invention appertains to new and useful improvements in apparatus for determining the ohmic resistance of electrical circuits and instruments.

Th'e principal object of this invention is to providey an apparatus whereby the proper resistance of the circuit or instrument can be determined by interposing the proper resistance and determining the Value of this resistance by a color code chart operating coincidentally with the apparatus.

Another important object of the invention is to provide an apparatus whereby various radio circuits and devices can be tested as to the proper resistance required.

Still another important object of the invention is to provide an apparatus for determining the proper resistance of various electrical circuits and instruments wherein the standard R. M. A. resistor color code is used in the form of a mobile chart coactive with the apparatus so that when the proper resistance has been interposed in the circuit being tested its value will be represented by the visible color combination.

During the course of the following specification other important objects and advantages of the invention will become apparent.

In the drawings:

Figure 1 represents a top plan View of the apparatus.

Figure 2 represents a top plan view of the apparatus with the top removed.

Figure 3 is a cross sectional view taken substantially on line 3-3 of Figure l.

Figure 4 is a longitudinal sectional View through the casing of the apparatus looking at the apparatus in side elevation.

Figure 5 is a fragmentary horizontal sectional view through the apparatus.

Figure 6 is a perspective View of the slidatle contactor and also fragmentarily showingy the conductor rail therefor.

Figure '7 is a fragmentary vertical sectional view taken substantially on the line l--l' of Figure 2.

Figure 8 is a fragmentary longitudinal sec tional View taken substantially on line 8 8 of Figure 5.

Figure 9 is a fragmentary plan view of one of the webs.

Figure 10 is a cross sectional view taken'substantially on line l-I of Figure 9.

Figure l1 is a fragmentary longitudinal sectional View taken substantially on line Il-Il or" Figure 5.

Figure 12 is a diagrammatic view disclosing the electrical devices and the connections between the same.

Referring to the drawings wherein like numerals designate like parts, it can be seen in Figures 3 and 4, that the apparatus consists of the elongated base 5 provided with the overlying plate B which is supported by downturned flanges 'l resting on the said base 5. Numeral 8 is the casing including the side wall af-b and the end walls c-d. The side and end walls of the casing 8 snugly engage the anges 'l of the plate 6. This casing 8 is provided with a pair of vertically disposed and longitudinally extending partitions S-l. This casing 8 is provided with the top Il which has the transversely elongated sight opening L2 therein and the longitudinally elongated sight openings i3, lil and I5 adjacent thereto. Upon this top l l is a suitable detachable plate iS on which instructions for operating the apparatus are located.

2l An elongated shaft (see Figure 3) denoted by numeral ll has its end portions journalled through the partitions Q-l'and the outer ends of the shaft il beyond the side walls a-b are provided with a hand wheel Iiii8 whereby this shaft H can be rotated along with the roll 20 carried thereby. Each end of this roll 28 is provided with a gear 2i as shown in Figures 2 and 3.

The partition is sufciently spaced from the side wall b to provide the compartment 2li, while between the partition l@ and the side wall a a similar compartment 23 is aiiorded.

As shown in Figures 2 and 4, two additional shafts 2&-25 are provided, one at each side of the shaft l'l and on each of the shafts 2li-25 g,

is a roll 26, the roll 226 at one side of the roll 20 is provided with pintle like extensions 2l carrying the spools 28-2Q, while the roll 26 at the opposite side of the roll 20 has pintle like extensions carrying the spools SI1-3i. The spools 28-38 are provided for the elongated ribbon 32 to be wound on while the spools ZQ-Iii is for the ribbon 33 to he wound on.

In the compartment 23 below the spools 'iii- 38 are located the rails 311-35, while in the compartment 22 below the spools 29-3l are located the rails Sii-3l. Each of these rails is provided with a top and bottom longitudinally extending grooveway 38 and each is provided with laterally bent end portions 39 for attachment to the corresponding partition 8 or l0, On the rails 34, 35, 3S and 3"! are located the sliding contactors generally referred to by numerals 4G, 6l. 42 and i3 respectively. Each of the sliding contactors consists of a block having a rectangular shaped opening therethrough. the block being denoted by A and being divided into upper and lower section 44-45 suitably secured together. 'Ihe upper section 44 is provided with a transversely extending groove or notch 48, while a roller 41 is mounted on the bottom of the section 45. The upper and lower sections 44-45 have recesses on the inside thereof for receiving ball bearings 48 which ride in the grooveways 88 of the corresponding conductor rail 85. (See Figures 3 and 6.)

Each of the ribbons 82-83 is provided with small protuberances 49. These protuberances are arranged in two longitudinally extending rows, each row terminating at the longitudinal intermediate portion of the ribbons, the protuberances of one row being alternately arranged across the ribbon with respect to the protuberances of the other row and these protuberances are engageable into the notch at 48 of the corresponding contactors 48-4I or 42-43 by moving the contactors along the corresponding resistor units generally referred to by numerals 58-5I or 52--58 respectively.

The units 58-5I-52 are of substantially the same construction, each consisting of an elongated dielectric tube 54 provided each with a depressed longitudinally extending portion 55 in which the resistance element 56 is disposed. Each of these tubes 54 as well as the tube 51 of the resistor 53 is provided with depending pins 58 at their end portions for disposition through openings in the base plate 6 where the pins are threaded and provided with nuts 59 to prevent rising of the pin. Coiled compressible springs 68 are interposed between the lower side portion of the tubes 54-51 and the plate 6 so as to normally urge the tubes upwardly and tensionally against the rollers 41 of the aforementioned contactors.

The resistor 5I has taps 68, 6I, 62, 63, 64, 65, 66, 61 and 68 taken therefrom and these taps are connected to the contacts 69, 18, 1|, 12, 13, 14, 15, 16 and 11 located on the panel board 18 supported by the partitions 9|8 (see Figure 2).

The resistor 58 has a tap 18 which connects to the conductor rail 35, and taps 19, 88, 8|, 82, 83, 84 and 85, which connect respectively to the contacts 86, 81, 88, 89, 98, 9|, 92 and 93.

The resistor unit 52 has a tap 94, which connects to the conductor rail 34, taps 95 and 96 which connect tn the panel board contacts 99 and 98, respectively. The tap 94 also extends to the zero contact |88.

The resistor 53 which is shown in Figure 8 consists of a plurality of resistance elements |8| embedded in the dielectric tube 51 and connected in series as at |82. The tops of these units are exposed to contacts by the contactor 43. (See Figure 3.) The rail 31 on which the slider 43 operates to engage the resistance element |8| is connected to the panel board contact |83 while one of the endmost resistance elements |8| is connected to the conductor rail 36 which carries the contactor 42 and which in turn is connected to the panel board contact |84.

The tap 68 of the resistor 5| is also connected t0 the panel board contact |85 and also the panel board contact |86 while the rail 35 is furthermore connected to the panel board contacts |81 and |88. A strap |88 having a fuse ||8 therein has branches to the contacts ||2 and ||8 as well as the contacts ||4, all located on the aforementioned panel board 18 and at the front end d of the canins 8. e

The outer side ot each of the partitions 8|8 has a pair of horizontally spaced pulleys III- |I8,-so that when `the corresponding contactors 48-4I or 42-48 have been moved to the end of the corresponding rails and resistors the protuberances 48 will leave the notches in the contactors and ride up over the contactors onto the corresponding spools 28-88 or 28-8I.

Having its ends wound on the rolls 28, is the elongated chart sheet ||1 on which are three longitudinally extending rows ot colors denoted by numerals ||8, ||8 and |28 and a row of ngures |2| denoting ohm resistance.

'I'hese color combinations are based on the R. M. A. standard of resistor color codes.

Obviously by rotating the intermediate roll 28 which has its gears 2| meshing with the gears |22 on the rolls 26, operation of the contactors will be had until the proper resistance is interposed in the instrument or circuit being treated.

`While the foregoing specification sets forth the invention in specific terms, it is to be understood that numerous changes in the shape, size and materials may be resorted to without departing from the spirit or scope of the invention as claimed hereinafter.

Having described the invention, what is claimed as new is:

l. In combination, a casing having a sight opening therein, a movable chart in the casing having color combinations thereon representing different values of resistance, means for actuating the chart, a variable resistance device, said chart being in turn adapted to actuate the variable resistance device, the same consisting of an elongated resiliently supported resistance ele` ment and a contactor for riding engagement thereon, a pair of rolls on which the said charts are wound, spool rotated by the said roll, a ribbon fed by the said spool, said ribbon being provided with a` plurality of protuberances for engaging and driving the said contactor.

2. In combination, a casing having a sight opening therein, a movable chart in the casing having color combinations thereon representing different values of resistance, means for actuating the chart, a variable resistance device, said chart being in turn adapted to actuate the variable resistance device, the same consisting of an elongated resiliently supported resistance element and a contactor for riding engagement thereon, a pair of rolls on which the said charts are wound, spool rotated by the said roll on which the said charts are wound, a ribbon fed by the said spool, said ribbon being provided with a plurality of protuberances for engaging and driving the said contactor, said contactor consisting of a slidable block provided with a contact roller mounted thereon and engaged with the resistor and having a notch therein for receiving the protuberances on the ribbon. 4

MIKE FEDOR, JR. 

